package com.server.modules.api.utils.poi;

import java.io.InputStream;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.xml.sax.XMLReader;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;


public class Excel2007Reader extends DefaultHandler {  
    //共享字符串表  
    private SharedStringsTable sst;  
    //上一次的内容  
    private String lastContents;  
    private boolean nextIsString;  
  
    private int sheetIndex = -1;  
    private List<String> rowlist = new ArrayList<String>();  
    //当前行  
    private int curRow = 0;  
    //当前列  
    private int curCol = 0;  
    //日期标志  
    private boolean dateFlag;  
    //数字标志  
    private boolean numberFlag;  
      
    private boolean isTElement;  
      
    private IRowReader rowReader;  
      
    public void setRowReader(IRowReader rowReader){  
        this.rowReader = rowReader;  
    }  
      
    /**只遍历一个电子表格，其中sheetId为要遍历的sheet索引，从1开始，1-3 
     * @param filename 
     * @param sheetId 
     * @throws Exception 
     */  
    public void processOneSheet(String filename,int sheetId) throws Exception {  
        OPCPackage pkg = OPCPackage.open(filename);  
        XSSFReader r = new XSSFReader(pkg);  
        SharedStringsTable sst = r.getSharedStringsTable();  
        XMLReader parser = fetchSheetParser(sst);  
          
        // 根据 rId# 或 rSheet# 查找sheet  
        InputStream sheet2 = r.getSheet("rId"+sheetId);  
        sheetIndex++;  
        InputSource sheetSource = new InputSource(sheet2);  
        parser.parse(sheetSource);  
        sheet2.close();  
    }  
  
    /** 
     * 遍历工作簿中所有的电子表格 
     * @param filename 
     * @throws Exception 
     */  
    public void process(String filename) throws Exception {  
        OPCPackage pkg = OPCPackage.open(filename);  
        XSSFReader r = new XSSFReader(pkg);  
        SharedStringsTable sst = r.getSharedStringsTable();  
        XMLReader parser = fetchSheetParser(sst);  
        Iterator<InputStream> sheets = r.getSheetsData();  
        while (sheets.hasNext()) {  
            curRow = 0;  
            sheetIndex++;  
            InputStream sheet = sheets.next();  
            InputSource sheetSource = new InputSource(sheet);  
            parser.parse(sheetSource);  
            sheet.close();  
        }  
    }  
    
    public void process(InputStream in) throws Exception {  
        OPCPackage pkg = OPCPackage.open(in);  
        XSSFReader r = new XSSFReader(pkg);  
        SharedStringsTable sst = r.getSharedStringsTable();  
        XMLReader parser = fetchSheetParser(sst);  
        Iterator<InputStream> sheets = r.getSheetsData();  
        while (sheets.hasNext()) {  
            curRow = 0;  
            sheetIndex++;  
            InputStream sheet = sheets.next();  
            InputSource sheetSource = new InputSource(sheet);  
            parser.parse(sheetSource);  
            sheet.close();  
        }  
    }  
  
    public XMLReader fetchSheetParser(SharedStringsTable sst)  
            throws SAXException {  
        org.xml.sax.XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");  
        this.sst = sst;  
        parser.setContentHandler(this);  
        return parser;  
    }  
  
    public void startElement(String uri, String localName, String name,  
            Attributes attributes) throws SAXException {  
          
        // c => 单元格  
        if ("c".equals(name)) {  
            // 如果下一个元素是 SST 的索引，则将nextIsString标记为true  
            String cellType = attributes.getValue("t");  
            if ("s".equals(cellType)) {  
                nextIsString = true;  
            } else {  
                nextIsString = false;  
            }  
            //日期格式  
            String cellDateType = attributes.getValue("s");  
            if ("1".equals(cellDateType)){  
                dateFlag = true;  
            } else {  
                dateFlag = false;  
            }  
            String cellNumberType = attributes.getValue("s");  
            if("2".equals(cellNumberType)){  
                numberFlag = true;  
            } else {  
                numberFlag = false;  
            }  
              
        }  
        //当元素为t时  
        if("t".equals(name)){  
            isTElement = true;  
        } else {  
            isTElement = false;  
        }  
          
        // 置空  
        lastContents = "";  
    }  
  
    public void endElement(String uri, String localName, String name)  
            throws SAXException {  
          
        // 根据SST的索引值的到单元格的真正要存储的字符串  
        // 这时characters()方法可能会被调用多次  
        if (nextIsString) {  
            try {  
                int idx = Integer.parseInt(lastContents);  
                lastContents = new XSSFRichTextString(sst.getEntryAt(idx))  
                        .toString();  
            } catch (Exception e) {  
  
            }  
        }   
        //t元素也包含字符串  
        if(isTElement){  
            String value = lastContents.trim();  
            rowlist.add(curCol, value);  
            curCol++;  
            isTElement = false;  
            // v => 单元格的值，如果单元格是字符串则v标签的值为该字符串在SST中的索引  
            // 将单元格内容加入rowlist中，在这之前先去掉字符串前后的空白符  
        } else if ("v".equals(name)) {  
            String value = lastContents.trim();  
            value = value.equals("")?" ":value;  
            //日期格式处理  
            if(dateFlag){  
                 Date date = HSSFDateUtil.getJavaDate(Double.valueOf(value));  
                 SimpleDateFormat dateFormat = new SimpleDateFormat(  
                 "dd/MM/yyyy");  
                 value = dateFormat.format(date);  
            }   
            //数字类型处理  
            if(numberFlag){  
                BigDecimal bd = new BigDecimal(value);  
                value = bd.setScale(3,BigDecimal.ROUND_UP).toString();  
            }  
            rowlist.add(curCol, value);  
            curCol++;  
        }else {  
            //如果标签名称为 row ，这说明已到行尾，调用 optRows() 方法  
            if (name.equals("row")) {  
                rowReader.getRows(sheetIndex,curRow,rowlist);  
                rowlist.clear();  
                curRow++;  
                curCol = 0;  
            }  
        }  
          
    }  
  
    public void characters(char[] ch, int start, int length)  
            throws SAXException {  
        //得到单元格内容的值  
        lastContents += new String(ch, start, length);  
    }  
}  
